Category: Refractory Technology

A. 5 to 10
B. 20 to 30
C. 45 to 60
D. 60 to 75

A. 1520
B. 1630
C. 1670
D. 1730

A. Has high fusion temperature (> 3000°C) but poor resistance to thermal shock
B. Has high resistance to basic slags
C. Which is expensive & radioactive, is used in crucibles for melting high purity metals
D. All A., B. and C.

A. Beehive oven
B. Coke oven walls
C. Zinc roaster
D. Lead blast furnace

A. Firebrick
B. Sillimanite
C. Magnesite
D. Aluminous firebrick

A. Silica
B. Fireclay
C. High alumina refractory
D. Carbon black

A. Chemical composition
B. Physical structure
C. Presence of impurities like iron & alkali
D. All A., B. and C.

A. Fireclay
B. Silica
C. Chrome magnesite
D. Zirconia

A. Modulus of rupture
B. Permanent linear change
C. Resistance to CO attack
D. RUL

A. Strength
B. Abrasion resistance
C. Both A. & B.
D. Neither A. nor B.